LUExpandableTableView

A subclass of UITableView with expandable and collapsible sections

Preview

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ sudo gem install cocoapods

CocoaPods 1.14.0+ is required.

To integrate LUExpandableTableView into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '13.0'
use_frameworks!

target '<Your Target Name>' do
    pod 'LUExpandableTableView'
end

Then, run the following command:

$ pod install

Swift Package Manager

To integrate using Apple's Swift Package Manager, add the following as a dependency to your Package.swift:

.package(url: "https://github.com/LaurentiuUngur/LUExpandableTableView", from: Version(6, 0, 0))

Manually

If you prefer not to use either of the before mentioned dependency managers, you can integrate LUExpandableTableView into your project manually.

Usage

• Import LUExpandableTableView into your project.

import LUExpandableTableView

• Register a cell for an instance of LUExpandableTableView. Registered class must be a subclass of UITableViewCell. This step is not be necessary if you use storyboard.

expandableTableView.register(MyTableViewCell.self, forCellReuseIdentifier: cellReuseIdentifier)

• Register a header for an instance of LUExpandableTableView. Registered class must be a subclass of LUExpandableTableViewSectionHeader Keep in mind that you cannot use storyboard in order to do this.

expandableTableView.register(UINib(nibName: "MyExpandableTableViewSectionHeader", bundle: Bundle.main), forHeaderFooterViewReuseIdentifier: sectionHeaderReuseIdentifier)

• Set as data source and delegate.

expandableTableView.expandableTableViewDataSource = self
expandableTableView.expandableTableViewDelegate = self

• Implement LUExpandableTableViewDataSource and LUExpandableTableViewDelegate protocols.

// MARK: - LUExpandableTableViewDataSource

extension ViewController: LUExpandableTableViewDataSource {
   func numberOfSections(in expandableTableView: LUExpandableTableView) -> Int {
       return 42
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, numberOfRowsInSection section: Int) -> Int {
       return 3
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
       guard let cell = expandableTableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier) as? MyTableViewCell else {
           assertionFailure("Cell shouldn't be nil")
           return UITableViewCell()
       }
       
       cell.label.text = "Cell at row \(indexPath.row) section \(indexPath.section)"
       
       return cell
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, sectionHeaderOfSection section: Int) -> LUExpandableTableViewSectionHeader {
       guard let sectionHeader = expandableTableView.dequeueReusableHeaderFooterView(withIdentifier: sectionHeaderReuseIdentifier) as? MyExpandableTableViewSectionHeader else {
           assertionFailure("Section header shouldn't be nil")
           return LUExpandableTableViewSectionHeader()
       }
       
       sectionHeader.label.text = "Section \(section)"
       
       return sectionHeader
   }
}

// MARK: - LUExpandableTableViewDelegate

extension ViewController: LUExpandableTableViewDelegate {
   func expandableTableView(_ expandableTableView: LUExpandableTableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
       /// Returning `UITableViewAutomaticDimension` value on iOS 9 will cause reloading all cells due to an iOS 9 bug with automatic dimensions
       return 50
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, heightForHeaderInSection section: Int) -> CGFloat {
       /// Returning `UITableViewAutomaticDimension` value on iOS 9 will cause reloading all cells due to an iOS 9 bug with automatic dimensions
       return 69
   }
   
   // MARK: - Optional
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, didSelectRowAt indexPath: IndexPath) {
       print("Did select cell at section \(indexPath.section) row \(indexPath.row)")
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, didSelectSectionHeader sectionHeader: LUExpandableTableViewSectionHeader, atSection section: Int) {
       print("Did select cection header at section \(section)")
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
       print("Will display cell at section \(indexPath.section) row \(indexPath.row)")
   }
   
   func expandableTableView(_ expandableTableView: LUExpandableTableView, willDisplaySectionHeader sectionHeader: LUExpandableTableViewSectionHeader, forSection section: Int) {
       print("Will display section header for section \(section)")
   }
}

For more usage details please see example app

Requirements

• Xcode 15.0+
• Swift 5.9+
• iOS 13.0+

Author

• Laurentiu Ungur

License

• LUExpandableTableView is available under the MIT license.